<?php
//error_reporting(E_STRICT | E_ERROR | E_WARNING | E_PARSE);
/*
 File: xajax.inc.php

Main xajax class and setup file.

Title: xajax class

Please see <copyright.inc.php> for a detailed description, copyright
and license information.
*/

/*
 @package xajax
@version $Id: xajax.inc.php 362 2007-05-29 15:32:24Z calltoconstruct $
@copyright Copyright (c) 2005-2007 by Jared White & J. Max Wilson
@copyright Copyright (c) 2008-2010 by Joseph Woolley, Steffen Konerow, Jared White  & J. Max Wilson
@license http://www.xajaxproject.org/bsd_license.txt BSD License
*/

/*
 Section: Standard Definitions
*/

/*
 String: XAJAX_DEFAULT_CHAR_ENCODING

Default character encoding used by both the <xajax> and
<xajaxResponse> classes.
*/
if (!defined ('XAJAX_DEFAULT_CHAR_ENCODING')) define ('XAJAX_DEFAULT_CHAR_ENCODING', 'utf-8');

/*
 String: XAJAX_PROCESSING_EVENT
String: XAJAX_PROCESSING_EVENT_BEFORE
String: XAJAX_PROCESSING_EVENT_AFTER
String: XAJAX_PROCESSING_EVENT_INVALID

Identifiers used to register processing events.  Processing events are essentially
hooks into the xajax core that can be used to add functionality into the request
processing sequence.
*/
if (!defined ('XAJAX_PROCESSING_EVENT')) define ('XAJAX_PROCESSING_EVENT', 'xajax processing event');
if (!defined ('XAJAX_PROCESSING_EVENT_BEFORE')) define ('XAJAX_PROCESSING_EVENT_BEFORE', 'beforeProcessing');
if (!defined ('XAJAX_PROCESSING_EVENT_AFTER')) define ('XAJAX_PROCESSING_EVENT_AFTER', 'afterProcessing');
if (!defined ('XAJAX_PROCESSING_EVENT_INVALID')) define ('XAJAX_PROCESSING_EVENT_INVALID', 'invalidRequest');

/*
 Class: xajax

The xajax class uses a modular plug-in system to facilitate the processing
of special Ajax requests made by a PHP page.  It generates Javascript that
the page must include in order to make requests.  It handles the output
of response commands (see <xajaxResponse>).  Many flags and settings can be
adjusted to effect the behavior of the xajax class as well as the client-side
javascript.
*/
final class xajax
{
	/*
		Array: aSettings

	This array is used to store all the configuration settings that are set during
	the run of the script.  This provides a single data store for the settings
	in case we need to return the value of a configuration option for some reason.

	It is advised that individual plugins store a local copy of the settings they
	wish to track, however, settings are available via a reference to the <xajax>
	object using <xajax->getConfiguration>.
	*/
	private $aSettings = array();

	/*
		Boolean: bErrorHandler

	This is a configuration setting that the main xajax object tracks.  It is used
	to enable an error handler function which will trap php errors and return them
	to the client as part of the response.  The client can then display the errors
	to the user if so desired.
	*/
	private $bErrorHandler;

	/*
		Array: aProcessingEvents

	Stores the processing event handlers that have been assigned during this run
	of the script.
	*/
	private $aProcessingEvents;

	/*
		Boolean: bExitAllowed

	A configuration option that is tracked by the main <xajax>object.  Setting this
	to true allows <xajax> to exit immediatly after processing a xajax request.  If
	this is set to false, xajax will allow the remaining code and HTML to be sent
	as part of the response.  Typically this would result in an error, however,
	a response processor on the client side could be designed to handle this condition.
	*/
	private $bExitAllowed;

	/*
		Boolean: bCleanBuffer

	A configuration option that is tracked by the main <xajax> object.  Setting this
	to true allows <xajax> to clear out any pending output buffers so that the
	<xajaxResponse> is (virtually) the only output when handling a request.
	*/
	private $bCleanBuffer;

	/*
		String: sLogFile

	A configuration setting tracked by the main <xajax> object.  Set the name of the
	file on the server that you wish to have php error messages written to during
	the processing of <xajax> requests.
	*/
	private $sLogFile;

	/*
		String: sCoreIncludeOutput

	This is populated with any errors or warnings produced while including the xajax
	core components.  This is useful for debugging core updates.
	*/
	private $sCoreIncludeOutput;

	/*
		Object: objPluginManager

	This stores a reference to the global <xajaxPluginManager>
	*/
	private $objPluginManager;

	/*
		Object: objArgumentManager

	Stores a reference to the global <xajaxArgumentManager>
	*/
	private $objArgumentManager;

	/*
		Object: objResponseManager

	Stores a reference to the global <xajaxResponseManager>
	*/
	private $objResponseManager;

	/*
		Object: objLanguageManager

	Stores a reference to the global <xajaxLanguageManager>
	*/
	private $objLanguageManager;

	private $challengeResponse;

	/*
		Constructor: xajax

	Constructs a xajax instance and initializes the plugin system.

	Parameters:

	sRequestURI - (optional):  The <xajax->sRequestURI> to be used
	for calls back to the server.  If empty, xajax fills in the current
	URI that initiated this request.
	*/
	public function __construct($sRequestURI=null, $sLanguage=null)
	{
		$this->bErrorHandler = false;
		$this->aProcessingEvents = array();
		$this->bExitAllowed = true;
		$this->bCleanBuffer = true;
		$this->sLogFile = '';

		$this->__wakeup();

		// The default configuration settings.
		$this->configureMany(
				array(
						'characterEncoding' => XAJAX_DEFAULT_CHAR_ENCODING,
						'decodeUTF8Input' => false,
						'outputEntities' => false,
						'responseType' => 'JSON',
						'defaultMode' => 'asynchronous',
						'defaultMethod' => 'POST',	// W3C: Method is case sensitive
						'wrapperPrefix' => 'xajax_',
						'debug' => false,
						'verbose' => false,
						'useUncompressedScripts' => false,
						'statusMessages' => false,
						'waitCursor' => true,
						'scriptDeferral' => false,
						'exitAllowed' => true,
						'errorHandler' => false,
						'cleanBuffer' => false,
						'allowBlankResponse' => false,
						'allowAllResponseTypes' => false,
						'generateStubs' => true,
						'logFile' => '',
						'timeout' => 6000,
						'version' => $this->getVersion()
				)
		);

		if (null !== $sRequestURI)
			$this->configure('requestURI', $sRequestURI);
		else
			$this->configure('requestURI', $this->_detectURI());

		if (null !== $sLanguage)
			$this->configure('language', $sLanguage);

		if ('utf-8' != XAJAX_DEFAULT_CHAR_ENCODING) $this->configure("decodeUTF8Input", true);

	}

	/*
		Function: __sleep
	*/
	public function __sleep()
	{
		$aMembers = get_class_vars(get_class($this));

		if (isset($aMembers['objLanguageManager']))
			unset($aMembers['objLanguageManager']);

		if (isset($aMembers['objPluginManager']))
			unset($aMembers['objPluginManager']);
			
		if (isset($aMembers['objArgumentManager']))
			unset($aMembers['objArgumentManager']);
			
		if (isset($aMembers['objResponseManager']))
			unset($aMembers['objResponseManager']);
			
		if (isset($aMembers['sCoreIncludeOutput']))
			unset($aMembers['sCoreIncludeOutput']);

		return array_keys($aMembers);
	}

	/*
		Function: __wakeup
	*/
	public function __wakeup()
	{
		ob_start();

		$sLocalFolder = dirname(__FILE__);

		//SkipAIO
		require $sLocalFolder . '/xajaxPluginManager.inc.php';
		require $sLocalFolder . '/xajaxLanguageManager.inc.php';
		require $sLocalFolder . '/xajaxArgumentManager.inc.php';
		require $sLocalFolder . '/xajaxResponseManager.inc.php';
		require $sLocalFolder . '/xajaxRequest.inc.php';
		require $sLocalFolder . '/xajaxResponse.inc.php';
		//EndSkipAIO

		// this is the list of folders where xajax will look for plugins
		// that will be automatically included at startup.
		$aPluginFolders = array();
		$aPluginFolders[] = dirname($sLocalFolder) . '/xajax_plugins';

		//SkipAIO
		$aPluginFolders[] = $sLocalFolder . '/plugin_layer';
		//EndSkipAIO

		// Setup plugin manager
		$this->objPluginManager = xajaxPluginManager::getInstance();
		$this->objPluginManager->loadPlugins($aPluginFolders);

		$this->objLanguageManager = xajaxLanguageManager::getInstance();
		$this->objArgumentManager = xajaxArgumentManager::getInstance();
		$this->objResponseManager = xajaxResponseManager::getInstance();

		$this->sCoreIncludeOutput = ob_get_clean();
		$this->configureMany($this->aSettings);

	}

	/*
		Function: getGlobalResponse

	Returns the <xajaxResponse> object preconfigured with the encoding
	and entity settings from this instance of <xajax>.  This is used
	for singleton-pattern response development.

	Returns:

	<xajaxResponse> : A <xajaxResponse> object which can be used to return
	response commands.  See also the <xajaxResponseManager> class.
	*/
	public static function &getGlobalResponse()
	{
		static $obj;
		if (!$obj) {
			$obj = new xajaxResponse();
		}
		return $obj;
	}

	/*
		Function: getVersion

	Returns:

	string : The current xajax version.
	*/
	public static function getVersion()
	{
		return 'xajax 0.5';
	}

	/*
		Function: register

	Call this function to register request handlers, including functions,
	callable objects and events.  New plugins can be added that support
	additional registration methods and request processors.


	Parameters:

	$sType - (string): Type of request handler being registered; standard
	options include:
	XAJAX_FUNCTION: a function declared at global scope.
	XAJAX_CALLABLE_OBJECT: an object who's methods are to be registered.
	XAJAX_EVENT: an event which will cause zero or more event handlers
	to be called.
	XAJAX_EVENT_HANDLER: register an event handler function.

	$sFunction || $objObject || $sEvent - (mixed):
	when registering a function, this is the name of the function
	when registering a callable object, this is the object being registered
	when registering an event or event handler, this is the name of the event
		
	$sIncludeFile || $aCallOptions || $sEventHandler
	when registering a function, this is the (optional) include file.
	when registering a callable object, this is an (optional) array
	of call options for the functions being registered.
	when registering an event handler, this is the name of the function.
	*/
	public function register($sType, $mArg)
	{
		$aArgs = func_get_args();
		$nArgs = func_num_args();

		if (2 < $nArgs)
		{
			if (XAJAX_PROCESSING_EVENT == $aArgs[0])
			{
				$sEvent = $aArgs[1];
				$xuf = $aArgs[2];

				if (false == is_a($xuf, 'xajaxUserFunction'))
					$xuf = new xajaxUserFunction($xuf);

				$this->aProcessingEvents[$sEvent] = $xuf;

				return true;
			}
		}

		return $this->objPluginManager->register($aArgs);
	}

	/*
		Function: configure

	Call this function to set options that will effect the processing of
	xajax requests.  Configuration settings can be specific to the xajax
	core, request processor plugins and response plugins.


	Parameters:

	Options include:
	javascript URI - (string): The path to the folder that contains the
	xajax javascript files.
	errorHandler - (boolean): true to enable the xajax error handler, see
	<xajax->bErrorHandler>
	exitAllowed - (boolean): true to allow xajax to exit after processing
	a request.  See <xajax->bExitAllowed> for more information.
	*/
	public function configure($sName, $mValue)
	{
		if ('errorHandler' == $sName) {
			if (true === $mValue || false === $mValue)
				$this->bErrorHandler = $mValue;
		} else if ('exitAllowed' == $sName) {
			if (true === $mValue || false === $mValue)
				$this->bExitAllowed = $mValue;
		} else if ('cleanBuffer' == $sName) {
			if (true === $mValue || false === $mValue)
				$this->bCleanBuffer = $mValue;
		} else if ('logFile' == $sName) {
			$this->sLogFile = $mValue;
		}

		$this->objLanguageManager->configure($sName, $mValue);
		$this->objArgumentManager->configure($sName, $mValue);
		$this->objPluginManager->configure($sName, $mValue);
		$this->objResponseManager->configure($sName, $mValue);

		$this->aSettings[$sName] = $mValue;
	}

	/*
		Function: configureMany

	Set an array of configuration options.

	Parameters:

	$aOptions - (array): Associative array of configuration settings
	*/
	public function configureMany($aOptions)
	{
		foreach ($aOptions as $sName => $mValue)
			$this->configure($sName, $mValue);
	}

	/*
		Function: getConfiguration

	Get the current value of a configuration setting that was previously set
	via <xajax->configure> or <xajax->configureMany>

	Parameters:

	$sName - (string): The name of the configuration setting

	Returns:

	$mValue : (mixed):  The value of the setting if set, null otherwise.
	*/
	public function getConfiguration($sName)
	{
		if (isset($this->aSettings[$sName]))
			return $this->aSettings[$sName];
		return NULL;
	}

	/*
		Function: canProcessRequest

	Determines if a call is a xajax request or a page load request.

	Return:

	boolean - True if this is a xajax request, false otherwise.
	*/
	public function canProcessRequest()
	{
		return $this->objPluginManager->canProcessRequest();
	}

	/*
		Function: VerifySession

	Ensure that an active session is available (primarily used
			for storing challenge / response codes).
	*/
	private function verifySession()
	{
		$sessionID = session_id();
		if ($sessionID === '') {
			$this->objResponseManager->debug(
					'Must enable sessions to use challenge/response.'
			);
			return false;
		}
		return true;
	}

	private function loadChallenges($sessionKey)
	{
		$challenges = array();

		if (isset($_SESSION[$sessionKey]))
			$challenges = $_SESSION[$sessionKey];

		return $challenges;
	}

	private function saveChallenges($sessionKey, $challenges)
	{
		if (count($challenges) > 10)
			array_shift($challenges);

		$_SESSION[$sessionKey] = $challenges;
	}

	private function makeChallenge($algo, $value)
	{
		// TODO: Move to configuration option
		if (null === $algo)
			$algo = 'md5';

		// TODO: Move to configuration option
		if (null === $value)
			$value = rand(100000, 999999);

		return hash($algo, $value);
	}

	/*
		Function: challenge

	Call this from the top of a xajax enabled request handler
	to introduce a challenge and response cycle into the request
	response process.

	NOTE:  Sessions must be enabled to use this feature.
	*/
	public function challenge($algo=null, $value=null)
	{
		if (false === $this->verifySession())
			return false;

		// TODO: Move to configuration option
		$sessionKey = 'xajax_challenges';

		$challenges = $this->loadChallenges($sessionKey);

		if (isset($this->challengeResponse))
		{
			$key = array_search($this->challengeResponse, $challenges);

			if ($key !== false)
			{
				unset($challenges[$key]);
				$this->saveChallenges($sessionKey, $challenges);
				return true;
			}
		}

		$challenge = $this->makeChallenge($algo, $value);

		$challenges[] = $challenge;

		$this->saveChallenges($sessionKey, $challenges);

		header("challenge: {$challenge}");

		return false;
	}

	/*
		Function: processRequest

	If this is a xajax request (see <xajax->canProcessRequest>), call the
	requested PHP function, build the response and send it back to the
	browser.

	This is the main server side engine for xajax.  It handles all the
	incoming requests, including the firing of events and handling of the
	response.  If your RequestURI is the same as your web page, then this
	function should be called before ANY headers or HTML is output from
	your script.

	This function may exit, if a request is processed.  See <xajax->bAllowExit>
	*/
	public function processRequest()
	{
		if (isset($_SERVER['HTTP_CHALLENGE_RESPONSE']))
			$this->challengeResponse = $_SERVER['HTTP_CHALLENGE_RESPONSE'];

		//SkipDebug
		// Check to see if headers have already been sent out, in which case we can't do our job
		if (headers_sent($filename, $linenumber)) {
			echo "Output has already been sent to the browser at {$filename}:{$linenumber}.\n";
			echo 'Please make sure the command $xajax->processRequest() is placed before this.';
			exit();
		}
		//EndSkipDebug

		if ($this->canProcessRequest())
		{
			// Use xajax error handler if necessary
			if ($this->bErrorHandler) {
				$GLOBALS['xajaxErrorHandlerText'] = "";
				set_error_handler("xajaxErrorHandler");
			}
				
			$mResult = true;

			// handle beforeProcessing event
			if (isset($this->aProcessingEvents[XAJAX_PROCESSING_EVENT_BEFORE]))
			{
				$bEndRequest = false;

				$this->aProcessingEvents[XAJAX_PROCESSING_EVENT_BEFORE]->call(
						array(&$bEndRequest)
				);

				$mResult = (false === $bEndRequest);
			}

			if (true === $mResult)
				$mResult = $this->objPluginManager->processRequest();

			if (true === $mResult)
			{
				if ($this->bCleanBuffer) {
					$er = error_reporting(0);
					while (ob_get_level() > 0) ob_end_clean();
					error_reporting($er);
				}

				// handle afterProcessing event
				if (isset($this->aProcessingEvents[XAJAX_PROCESSING_EVENT_AFTER]))
				{
					$bEndRequest = false;

					$this->aProcessingEvents[XAJAX_PROCESSING_EVENT_AFTER]->call(
							array($bEndRequest)
					);

					if (true === $bEndRequest)
					{
						$this->objResponseManager->clear();
						$this->objResponseManager->append($aResult[1]);
					}
				}
			}
			else if (is_string($mResult))
			{
				if ($this->bCleanBuffer) {
					$er = error_reporting(0);
					while (ob_get_level() > 0) ob_end_clean();
					error_reporting($er);
				}

				// $mResult contains an error message
				// the request was missing the cooresponding handler function
				// or an error occurred while attempting to execute the
				// handler.  replace the response, if one has been started
				// and send a debug message.

				$this->objResponseManager->clear();
				$this->objResponseManager->append(new xajaxResponse());

				// handle invalidRequest event
				if (isset($this->aProcessingEvents[XAJAX_PROCESSING_EVENT_INVALID]))
					$this->aProcessingEvents[XAJAX_PROCESSING_EVENT_INVALID]->call();
				else
					$this->objResponseManager->debug($mResult);
			}

			if ($this->bErrorHandler) {
				$sErrorMessage = $GLOBALS['xajaxErrorHandlerText'];
				if (!empty($sErrorMessage)) {
					if (0 < strlen($this->sLogFile)) {
						$fH = @fopen($this->sLogFile, "a");
						if (NULL != $fH) {
							fwrite(
									$fH,
									$this->objLanguageManager->getText('LOGHDR:01')
									. strftime("%b %e %Y %I:%M:%S %p")
									. $this->objLanguageManager->getText('LOGHDR:02')
									. $sErrorMessage
									. $this->objLanguageManager->getText('LOGHDR:03')
							);
							fclose($fH);
						} else {
							$this->objResponseManager->debug(
									$this->objLanguageManager->getText('LOGERR:01')
									. $this->sLogFile
							);
						}
					}
					$this->objResponseManager->debug(
							$this->objLanguageManager->getText('LOGMSG:01')
							. $sErrorMessage
					);
				}
			}

			$this->objResponseManager->send();

			if ($this->bErrorHandler) restore_error_handler();

			if ($this->bExitAllowed) exit();
		}
	}

	/*
		Function: printJavascript

	Prints the xajax Javascript header and wrapper code into your page.
	This should be used to print the javascript code between the HEAD
	and /HEAD tags at the top of the page.

	The javascript code output by this function is dependent on the plugins
	that are included and the functions that are registered.

	*/
	public function printJavascript()
	{
		$this->objPluginManager->generateClientScript();
	}

	/*
		Function: getJavascript

	See <xajax->printJavascript> for more information.
	*/
	public function getJavascript()
	{
		ob_start();
		$this->printJavascript();
		return ob_get_clean();
	}

	/*
		Function: autoCompressJavascript

	Creates a new xajax_core, xajax_debug, etc... file out of the
	_uncompressed file with a similar name.  This strips out the
	comments and extraneous whitespace so the file is as small as
	possible without modifying the function of the code.

	Parameters:

	sJsFullFilename - (string):  The relative path and name of the file
	to be compressed.
	bAlways - (boolean):  Compress the file, even if it already exists.
	*/
	public function autoCompressJavascript($sJsFullFilename=NULL, $bAlways=false)
	{
		$sJsFile = 'xajax_js/xajax_core.js';

		if ($sJsFullFilename) {
			$realJsFile = $sJsFullFilename;
		}
		else {
			$realPath = realpath(dirname(dirname(__FILE__)));
			$realJsFile = $realPath . '/'. $sJsFile;
		}

		// Create a compressed file if necessary
		if (!file_exists($realJsFile) || true == $bAlways) {
			$srcFile = str_replace('.js', '_uncompressed.js', $realJsFile);
			if (!file_exists($srcFile)) {
				trigger_error(
						$this->objLanguageManager->getText('CMPRSJS:RDERR:01')
						. dirname($realJsFile)
						. $this->objLanguageManager->getText('CMPRSJS:RDERR:02')
						, E_USER_ERROR
				);
			}
				
			require_once(dirname(__FILE__) . '/xajaxCompress.inc.php');
			$javaScript = implode('', file($srcFile));
			$compressedScript = xajaxCompressFile($javaScript);
			$fH = @fopen($realJsFile, 'w');
			if (!$fH) {
				trigger_error(
						$this->objLanguageManager->getText('CMPRSJS:WTERR:01')
						. dirname($realJsFile)
						. $this->objLanguageManager->getText('CMPRSJS:WTERR:02')
						, E_USER_ERROR
				);
			}
			else {
				fwrite($fH, $compressedScript);
				fclose($fH);
			}
		}
	}

	private function _compressSelf($sFolder=null)
	{
		if (null == $sFolder)
			$sFolder = dirname(dirname(__FILE__));
			
		require_once(dirname(__FILE__) . '/xajaxCompress.inc.php');

		if ($handle = opendir($sFolder)) {
			while (!(false === ($sName = readdir($handle)))) {
				if ('.' != $sName && '..' != $sName && is_dir($sFolder . '/' . $sName)) {
					$this->_compressSelf($sFolder . '/' . $sName);
				} else if (8 < strlen($sName) && 0 == strpos($sName, '.compressed')) {
					if ('.inc.php' == substr($sName, strlen($sName) - 8, 8)) {
						$sName = substr($sName, 0, strlen($sName) - 8);
						$sPath = $sFolder . '/' . $sName . '.inc.php';
						if (file_exists($sPath)) {
								
							$aParsed = array();
							$aFile = file($sPath);
							$nSkip = 0;
							foreach (array_keys($aFile) as $sKey)
								if ('//SkipDebug' == $aFile[$sKey])
								++$nSkip;
							else if ('//EndSkipDebug' == $aFile[$sKey])
								--$nSkip;
							else if (0 == $nSkip)
								$aParsed[] = $aFile[$sKey];
							unset($aFile);
								
							$compressedScript = xajaxCompressFile(implode('', $aParsed));
								
							$sNewPath = $sPath;
							$fH = @fopen($sNewPath, 'w');
							if (!$fH) {
								trigger_error(
										$this->objLanguageManager->getText('CMPRSPHP:WTERR:01')
										. $sNewPath
										. $this->objLanguageManager->getText('CMPRSPHP:WTERR:02')
										, E_USER_ERROR
								);
							}
							else {
								fwrite($fH, $compressedScript);
								fclose($fH);
							}
						}
					}
				}
			}
				
			closedir($handle);
		}
	}

	public function _compile($sFolder=null, $bWriteFile=true)
	{
		if (null == $sFolder)
			$sFolder = dirname(__FILE__);
			
		require_once(dirname(__FILE__) . '/xajaxCompress.inc.php');

		$aOutput = array();

		if ($handle = opendir($sFolder)) {
			while (!(false === ($sName = readdir($handle)))) {
				if ('.' != $sName && '..' != $sName && is_dir($sFolder . '/' . $sName)) {
					$aOutput[] = $this->_compile($sFolder . '/' . $sName, false);
				} else if (8 < strlen($sName)) {
					if ('.inc.php' == substr($sName, strlen($sName) - 8, 8)) {
						$sName = substr($sName, 0, strlen($sName) - 8);
						$sPath = $sFolder . '/' . $sName . '.inc.php';
						if (
								'xajaxAIO' != $sName &&
								'xajaxCompress' != $sName
						) {
							if (file_exists($sPath)) {

								$aParsed = array();
								$aFile = file($sPath);
								$nSkip = 0;
								foreach (array_keys($aFile) as $sKey)
									if ('//SkipDebug' == substr($aFile[$sKey], 0, 11))
									++$nSkip;
								else if ('//EndSkipDebug' == substr($aFile[$sKey], 0, 14))
									--$nSkip;
								else if ('//SkipAIO' == substr($aFile[$sKey], 0, 9))
									++$nSkip;
								else if ('//EndSkipAIO' == substr($aFile[$sKey], 0, 12))
									--$nSkip;
								else if ('<'.'?php' == substr($aFile[$sKey], 0, 5)) {
								}
								else if ('?'.'>' == substr($aFile[$sKey], 0, 2)) {
								}
								else if (0 == $nSkip)
									$aParsed[] = $aFile[$sKey];
								unset($aFile);

								$aOutput[] = xajaxCompressFile(implode('', $aParsed));
							}
						}
					}
				}
			}
				
			closedir($handle);
		}

		if ($bWriteFile)
		{
			$fH = @fopen($sFolder . '/xajaxAIO.inc.php', 'w');
			if (!$fH) {
				trigger_error(
						$this->objLanguageManager->getText('CMPRSAIO:WTERR:01')
						. $sFolder
						. $this->objLanguageManager->getText('CMPRSAIO:WTERR:02')
						, E_USER_ERROR
				);
			}
			else {
				fwrite($fH, '<'.'?php ');
				fwrite($fH, implode('', $aOutput));
				fclose($fH);
			}
		}

		return implode('', $aOutput);
	}

	/*
		Function: _detectURI

	Returns the current requests URL based upon the SERVER vars.

	Returns:

	string : The URL of the current request.
	*/
	private function _detectURI() {
		$aURL = array();

		// Try to get the request URL
		if (!empty($_SERVER['REQUEST_URI'])) {

			$_SERVER['REQUEST_URI'] = str_replace(
					array('"',"'",'<','>'),
					array('%22','%27','%3C','%3E'),
					$_SERVER['REQUEST_URI']
			);

			$aURL = parse_url($_SERVER['REQUEST_URI']);
		}

		// Fill in the empty values
		if (empty($aURL['scheme'])) {
			if (!empty($_SERVER['HTTP_SCHEME'])) {
				$aURL['scheme'] = $_SERVER['HTTP_SCHEME'];
			} else {
				$aURL['scheme'] =
				(!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) != 'off')
				? 'https'
				: 'http';
			}
		}

		if (empty($aURL['host'])) {
			if (!empty($_SERVER['HTTP_X_FORWARDED_HOST'])) {
				if (strpos($_SERVER['HTTP_X_FORWARDED_HOST'], ':') > 0) {
					list($aURL['host'], $aURL['port']) = explode(':', $_SERVER['HTTP_X_FORWARDED_HOST']);
				} else {
					$aURL['host'] = $_SERVER['HTTP_X_FORWARDED_HOST'];
				}
			} else if (!empty($_SERVER['HTTP_HOST'])) {
				if (strpos($_SERVER['HTTP_HOST'], ':') > 0) {
					list($aURL['host'], $aURL['port']) = explode(':', $_SERVER['HTTP_HOST']);
				} else {
					$aURL['host'] = $_SERVER['HTTP_HOST'];
				}
			} else if (!empty($_SERVER['SERVER_NAME'])) {
				$aURL['host'] = $_SERVER['SERVER_NAME'];
			} else {
				echo $this->objLanguageManager->getText('DTCTURI:01');
				echo $this->objLanguageManager->getText('DTCTURI:02');
				exit();
			}
		}

		if (empty($aURL['port']) && !empty($_SERVER['SERVER_PORT'])) {
			$aURL['port'] = $_SERVER['SERVER_PORT'];
		}

		if (!empty($aURL['path']))
			if (0 == strlen(basename($aURL['path'])))
			unset($aURL['path']);

		if (empty($aURL['path'])) {
			$sPath = array();
			if (!empty($_SERVER['PATH_INFO'])) {
				$sPath = parse_url($_SERVER['PATH_INFO']);
			} else {
				$sPath = parse_url($_SERVER['PHP_SELF']);
			}
			if (isset($sPath['path']))
				$aURL['path'] = str_replace(array('"',"'",'<','>'), array('%22','%27','%3C','%3E'), $sPath['path']);
			unset($sPath);
		}

		if (empty($aURL['query']) && !empty($_SERVER['QUERY_STRING'])) {
			$aURL['query'] = $_SERVER['QUERY_STRING'];
		}

		if (!empty($aURL['query'])) {
			$aURL['query'] = '?'.$aURL['query'];
		}

		// Build the URL: Start with scheme, user and pass
		$sURL = $aURL['scheme'].'://';
		if (!empty($aURL['user'])) {
			$sURL.= $aURL['user'];
			if (!empty($aURL['pass'])) {
				$sURL.= ':'.$aURL['pass'];
			}
			$sURL.= '@';
		}

		// Add the host
		$sURL.= $aURL['host'];

		// Add the port if needed
		if (!empty($aURL['port'])
				&& (($aURL['scheme'] == 'http' && $aURL['port'] != 80)
						|| ($aURL['scheme'] == 'https' && $aURL['port'] != 443))) {
			$sURL.= ':'.$aURL['port'];
		}

		// Add the path and the query string
		$sURL.= $aURL['path'].@$aURL['query'];

		// Clean up
		unset($aURL);

		$aURL = explode("?", $sURL);

		if (1 < count($aURL))
		{
			$aQueries = explode("&", $aURL[1]);

			foreach ($aQueries as $sKey => $sQuery)
			{
				if ("xjxGenerate" == substr($sQuery, 0, 11))
					unset($aQueries[$sKey]);
			}
				
			$sQueries = implode("&", $aQueries);
				
			$aURL[1] = $sQueries;
				
			$sURL = implode("?", $aURL);
		}

		return $sURL;
	}

}

/*
 Section: Global functions
*/

/*
 Function xajaxErrorHandler

This function is registered with PHP's set_error_handler if the xajax
error handling system is enabled.

See <xajax->bUserErrorHandler>
*/
function xajaxErrorHandler($errno, $errstr, $errfile, $errline)
{
	$errorReporting = error_reporting();
	if (($errno & $errorReporting) == 0) return;

	if ($errno == E_NOTICE) {
		$errTypeStr = 'NOTICE';
	}
	else if ($errno == E_WARNING) {
		$errTypeStr = 'WARNING';
	}
	else if ($errno == E_USER_NOTICE) {
		$errTypeStr = 'USER NOTICE';
	}
	else if ($errno == E_USER_WARNING) {
		$errTypeStr = 'USER WARNING';
	}
	else if ($errno == E_USER_ERROR) {
		$errTypeStr = 'USER FATAL ERROR';
	}
	else if (defined('E_STRICT') && $errno == E_STRICT) {
		return;
	}
	else {
		$errTypeStr = 'UNKNOWN: ' . $errno;
	}

	$sCrLf = "\n";

	ob_start();
	echo $GLOBALS['xajaxErrorHandlerText'];
	echo $sCrLf;
	echo '----';
	echo $sCrLf;
	echo '[';
	echo $errTypeStr;
	echo '] ';
	echo $errstr;
	echo $sCrLf;
	echo 'Error on line ';
	echo $errline;
	echo ' of file ';
	echo $errfile;
	$GLOBALS['xajaxErrorHandlerText'] = ob_get_clean();
}

